CC: @iemejia

Unfortunately the previous enhancement #1239 could not fix the beam-sdks-java-io-hcatalog problem: https://gist.github.com/suztomo/b175357b2fb7d03d69204dc1f35c4d20

suztomo@suxtomo24:~/beam6$ ./gradlew -Ppublishing -PjavaLinkageArtifactIds=beam-sdks-java-io-hcatalog :checkJavaLinkage
...
> Task :checkJavaLinkage
...
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
        at java.util.Arrays.copyOf(Arrays.java:3181)
        at java.util.ArrayList.grow(ArrayList.java:265)
        at java.util.ArrayList.ensureExplicitCapacity(ArrayList.java:239)
        at java.util.ArrayList.ensureCapacityInternal(ArrayList.java:231)
        at java.util.ArrayList.add(ArrayList.java:462)
        at com.google.cloud.tools.opensource.dependencies.DependencyGraph.addPath(DependencyGraph.java:68)
        at com.google.cloud.tools.opensource.dependencies.DependencyGraphBuilder.levelOrder(DependencyGraphBuilder.java:333)
        at com.google.cloud.tools.opensource.dependencies.DependencyGraphBuilder.buildDependencyGraph(DependencyGraphBuilder.java:236)
        at com.google.cloud.tools.opensource.dependencies.DependencyGraphBuilder.buildFullDependencyGraph(DependencyGraphBuilder.java:202)
        at com.google.cloud.tools.opensource.classpath.ClassPathBuilder.resolve(ClassPathBuilder.java:69)
        at com.google.cloud.tools.opensource.classpath.LinkageCheckerMain.main(LinkageCheckerMain.java:73)

> Task :checkJavaLinkage FAILED
...
BUILD FAILED in 48m 29s
903 actionable tasks: 160 executed, 743 up-to-date

(It did show great enhancement in beam-sdks-java-extensions-sql-zetasql. comment)

Todo

Investigate why beam-sdks-java-io-hcatalog is so heavy.

• Test case: 99852024
• How many nodes in the graph (levelOrder’s argument)? More than 3,000,000. After 2,000,000, it becomes very slow. It had 80,000,000 nodes in the tree.
• Any node that has unexpectedly many children? (say 100)

Opportunity to optimize the reseult.